WO2003077844A2 - Effect of treatment with 4,5-dihydroxy- 2-cyclopenten-1-one (dhcp) on gene expression and quorum-sensing in bacteria - Google Patents
Effect of treatment with 4,5-dihydroxy- 2-cyclopenten-1-one (dhcp) on gene expression and quorum-sensing in bacteria Download PDFInfo
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Definitions
- DHCP 5-dihydroxy-2- cyclopenten-1-one
- DHCP is also synthesized by microorganisms.
- SAM S-adenosylmethionine
- SAH S-adenosylhomocysteine
- a multicopy suppressor for the DHCP toxicity was isolated from an E . coli genomic library.
- the gene encoding this suppressor was designated as dep and the putative protein encoded by this gene as Dep.
- the Dep protein showed high homology to known efflux proteins conferring resistance to a number of antibiotics including chloramphenicol, bicyclomycin and tetracycline . However, it did not confer cross-resistance to any of the antibiotics tested (Phadtare et al . , 2001). The exact mechanism of action of DHCP is not known.
- DHCP has also been of interest in the studies regarding quorum-sensing in E. coli (Schauder et al . , 2001) .
- Many bacteria have the ability to control expression of specific genes by secreting low-molecular-weight signaling phermones in association with the growth phase. This process is termed as quorum-sensing.
- Physiological processes controlled by quorum-sensing occur in diverse species of bacteria and include bioluminescence, antibiotic synthesis, pathogenicity, protein secretion, capsular exopolysaccharide synthesis, biofilm formation and motility (for review see Miller et al . , 2001; Schauder et al . , 2001 and Whitehead et al .
- Vibrio harveyi a gram-negative bioluminescent marine bacterium regulates light production in response to two distinct autoinducers AI-1 and AI-2.
- AI-1 is homoserine lactone and is used for intraspecies communication.
- AI-2 is used for interspecies communication and its structure is not known.
- AI-2 is produced from SAM and the biosynthetic pathway and the biochemical intermediates in its biosynthesis are identical in E . coli, S . typhimurium, V. harveyi , V. cholerae and Enterococcus faecalis .
- DHCP did not show any activity in the screening assay and was thus excluded as a possible candidate for AI-2 (Schauder et al . , 2001) .
- the present invention provides a method for regulating a gene in a microorganism by contacting a microorganism, in which the gene is to be regulated, with 4 , 5-dihydroxy-2- cyclopenten-1-one (DHCP) and thereby regulating the gene in the microorganism.
- the gene to be regulated includes genes responding to stress, genes involved in membrane synthesis and membrane function, genes encoding proteins with diverse functions, and genes encoding proteins of unknown function.
- Non-limiting examples of such a gene to be regulated include the genes listed in Tables 1-7 hereinbelow and homologues thereof.
- the gene is involved in quorum-sensing processes such as a result of switching on/off of a quorum-sensing circuit or of an activity of an interspecies autoinducer AI-2.
- the present invention also provides a method for screening a physiologically active substance, which influences the expression level of a gene whose expression level is also influenced by DHCP, and a physiologically active substance obtainable by this method.
- This method involves incubating a microorganism in the presence and in the absence of the candidate substance and then determining the expression level of genes in the microorganism in the presence and in the absence of the candidate substance, where the genes are ones in which their expression levels are influenced by DHCP.
- a candidate substance is identified as a physiologically active substance which significantly influences the expression level of at least one of the genes if the expression levels in the presence of the candidate substance is significantly enhanced or reduced relative to expression levels in the absence of the candidate substance.
- Non-limiting examples of a gene for use in this screening method include the genes listed in Tables 1-7 hereinbelow and homologues thereof.
- the expression levels of the genes are determined based on the amounts of mRNA transcribed from the genes or by hybridization using a DNA microarray.
- Another aspect of the present invention is directed to a method for enhancing the production of a recombinant polypeptide in a microorganism involving culturing a microorganism in the presence of DHCP to enhance the expression and production of a recombinant polypeptide and then recovering the recombinant polypeptide produced from the culture.
- a further aspect of the present invention is directed to a method for inhibiting the activity of an interspecies quorum-sensing inducer, such as inducer AI-2, using DHCP as an active ingredient.
- Still further aspects of the present invention are directed to use of DHCP for the manufacture of a composition for regulating a gene in a microorganism by a method according to the present invention and to compositions containing DHCP as an active ingredient for regulating a gene in a microorganism; for regulating quorum-sensing, such as the expression of cysK; for switching on/off of a quorum-sensing circuit; for inhibiting an activity of an interspecies quorum-sensing inducer, such as AI- 2; for regulating expression of a gene responding to stress; for regulating expression of a regulatory gene for quorum-sensing; for promoting secretion of a recombinant protein; for regulating expression of a gene selected from those listed in Tables 1 to 7, or for maintaining homeostasis.
- quorum-sensing such as the expression of cysK
- AI- 2 for inhibiting an activity of an interspecies quorum-sen
- Figure 1 are gels showing the effect of DHCP on the levels of RNAs.
- Total RNA was extracted by the hot phenol method as described in the Materials and Methods section of Example 1, and primer extension analysis was carried out with oligonucleotides corresponding to osmY, dps, rpoS, katG, cysK, tehA, zipA, and ompF.
- Lanes 1 and 2 in each case represent mRNAs isolated from control (untreated) and DHCP treated cells, respectively.
- FIGS. 2A and 2B are graphs showing DHCP inhibits AI- 2 activity.
- the AI-2 activity assay was carried out as described in Materials and Methods section of Example 1. The luminescence seen with V. harveyi BB152 was assumed as 100% and • the other activities were expressed as relative %.
- the lanes are as follows: Sterile AB medium, lane 1; V. harveyi BB152 culture fluid, lane 2; DHCP (250 ⁇ M) , lane 3; DHCP (250 ⁇ M) plus V. harveyi BB152 culture fluid, lane 4.
- DHCP was added to the reaction mixtures after maximum luminescence was generated by AI-2, at a concentration of 250 ⁇ M (closed circles) and 100 ⁇ M (open squares) .
- the corresponding control activity of AI-2 without DHCP addition is also shown (open triangles) .
- the light production was monitored at various time points with a liquid scintillation counter.
- the present inventors analyzed the global transcriptional pattern of E . coli in response to DHCP by DNA microarray to (i) explore the manifestation of the antibacterial activity of DHCP and (ii) explore the possibility of DHCP being involved in the quorum-sensing pathways of E. coli .
- the results obtained by the present inventors showed that (i) DHCP has widespread effects in E. coli, affecting genes encoding proteins involved in general metabolism and membrane synthesis and functions, and that (ii) the genes comprising quorum-regulated processes such as virulence, motility and outer membrane functions are affected by DHCP treatment.
- the sapF gene from E. coli is homologous to sapF from V. fischeri, the latter having been shown to be enhanced by the LuxR-AI complex, and it was . suggested that sapF to play a role in the bioluminescence of V. fischeri (Chen et al . , 2000) .
- cysK which is a known quorum sensing gene working in an alternate pathway (s) in E .
- E. coli wild-type strain JM83 [F ⁇ ara ⁇ (lac-proAB) rps ( str r ) ] (Yanisch-Perron et al . , 1985) was grown in Luria broth (LB) .
- V. harveyi strains BB152 and BB170 were a gift from Dr. Bonnie Bassler (Princeton University). These strains were grown in AB medium as described previously (Surette et al . , 1999) .
- E. coli cells grown overnight in LB medium were diluted into fresh LB medium. After the growth reached a Klett unit of 50, DHCP was added (250 ⁇ M) and growth was further monitored. After growth reached a Klett unit of 90-100, it was diluted 10-fold into a medium containing the same concentration of DHCP as described previously (Phadtare et al . , 2001). The cells were harvested after a total of 8 h of incubation with DHCP. Control cells were grown in a similar manner without DHCP and harvested at an OD60 0 comparable to the final OD 60 o of the DHCP-treated cells. The total RNA was extracted by the hot phenol method described previously (Sarmientos et al .
- mRNAs were labeled with Cy3-d ⁇ TP and Cy5-dUTP (Amersham Pharmacia) .
- Random Hexamer pd(N) 6 was used as a primer and the IntelliGene E . coli CHIP Version 1 (Takara Shuzo, Co. Ltd., Japan) the DNA microarray was used.
- the primers used for detection of the respective mRNAs were: Primer 750077, 5' -TACAGCCAGCAGAGTTTTCGAAAT-3' (SEQ ID NO:l), that corresponds to the sequence from the 15 th to the 8 th codon of osmY (Yim et al .
- primer 750078 5'- ATAAAGCAGATTGGTCGCTTTTGA-3' (SEQ ID NO : 2 ) , that corresponds to the sequence from the 16 th to the 9 th codon of dps (Altuvia et al., 1994); Primer 979747, 5' -CAGCGTATTCTGACTCATAAGGTG-3' (SEQ ID NO: 3), that corresponds to the region from the 6 th codon of rpoS (Takayanagi et al .
- primer 956660 5'-AGT GGCTGTGGTGTTATGGATATC-3' (SEQ ID NO : ) , that corresponds to the region from 13 th to the 6 th codon of katG (Triggs-Raine et al . , 1998); primer 3969805, 5' -CAGGCGAACCAGCGGCGTGTGACC-3' (SEQ ID NO:5), that corresponds to the region from 20 th to the 13 th codon of cysK (Byrne et al .
- 5'-ACGGGATCCTTCATCATTATTTATTA-3' (SEQ ID NO : 8 ) , that includes the region encompassing from the first codon of ompF (accession numbers, J01655, M10311 and M10312).
- the primers were labeled with [ ⁇ - 32 P] ATP (Du-Pont-New England Nuclear] by using T4 polynucleotide kinase (Gibco BRL) .
- Primer extension was carried out with 5 ⁇ g of RNA at 42 °C for 1 h in a final reaction volume of 10 ⁇ l, with 50 mM Tris-HCl (pH 8.5), 8 mM MgCl 2 , 30 mM KC1, ImM dithiothreitol, 0.4 pmol of 32 P-labeled primer, 0.5 mM each of the dNTPs, 10 U RNase inhibitor (Boehringer Mannheim) and 6.25 ⁇ of reverse transcriptase (Boehringer Mannheim). The products were analyzed on a 6% polyacrylamide gel under denaturing conditions. Quantitation of primer extension products was carried out by direct radioactive measurements .
- V. harveyi reporter strain (BB170) were carried out as described by Surette and Bassler (Surette et al . , 1999).
- Cell-free culture fluid from V. harveyi BB152 strain was used as a positive control.
- Sterile AB medium was used a negative control.
- the V. harveyi BB170 strain was grown overnight with aeration at 30 °C in the AB medium and the cells were then diluted 1:5000 in the fresh medium.
- the diluted culture (90 ⁇ l) was added in the assay mixture containing 10 ⁇ l of AB medium or cell-free culture fluid of V.
- harveyi BB152/DHCP 100-250 ⁇ M
- AI-2 To check the effect of DHCP on the light production by AI-2, it was added to the reaction mixture after the maximum luminescence was achieved. The light production was monitored with a liquid scintillation counter .
- RNAs isolated from the respective cells were used to generate probes for hybridization of DNA arrays and the data were quantified as described in the Materials and Methods section of this Example. Calculation of the log expression ratios of the corresponding spots allowed pair-wise comparisons of the relative transcript levels for each of the E. coli genes under the two growth conditions. Only those genes whose expression levels differed by log ratio of at least four were considered. In some cases, genes belonging to same operon or category were considered even if the log ratios differed by the factor of only three or little less than three. Log ratios above zero value indicate induction and below zero value indicate repression by DHCP treatment. The results seen by DNA microarray analysis were confirmed by primer extension using oligonucleotides corresponding to some of the genes significantly affected . The results are shown in Fig . 1 and summarized in Table 1. The results of both methods are in agreement with each other .
- Ratio of the respective mRNA levels in the DHCP-treateci to control (untreated) cells in each case is shov/n.
- the laboratory of the present inventors observed that a large number of the responding genes comprised broad functional categories: (i) genes encoding ribosomal proteins, (ii) genes encoding the global regulator of stress response-RpoS and the RpoS-regulated proteins, (iii) genes involved in membrane synthesis and functions such as transport, (iv) genes encoding proteins involved in general metabolism, (v) genes encoding proteins with miscellaneous functions, and (vi) genes encoding hypothetical proteins and proteins of unknown functions or class.
- creD is regulated by CreBC, the first member of the ere regulon and a presumed global regulator (Avision et al . , 2001) .
- CreBC CreBC
- talA Another gene regulated by CreBC is talA (Avision et al . , 2001), which also increased 7.6 times in the present study (Table 6) .
- talA encodes an enzyme involved in the mobilization of glyceraldehydes-3-phosphate into the pentose phosphate pathway.
- CreBC-regulated genes such as yidS, and yiel, the products of which have not been assigned any function yet, also increased 4 times (Table 7) .
- CreBC genes known to be regulated by CreBC such as, ackA, pta, radC, malE and trgB were not induced by DHCP.. In fact, ackA decreased 3.6 times (Table 5) . Some additional factors may be involved in the regulation of expression of these genes .
- RpoS is a global stress response regulator and it is also known to be involved in quorum-sensing in E. coli (Hengge- Aronis, 2000 and Sitnikov et al . , 1996) .
- DHCP oxidative and osmotic stress
- DHCP treatment affected the general metabolism of the cell was next examined. Similar to the effect on membrane, DHCP treatment affected a number of processes involved in general metabolism of the cell, some of these probably being secondary effects of the treatment. 44 genes showed a significantly different level of expression after DHCP treatment (Table 5) . The most prominent genes were the ones encoding proteins involved in cysteine synthesis.
- Table 6 lists 35 genes showing significant level of induction or inhibition after DHCP treatment.
- tehB encoding TehB, involved in tellurite resistance was induced 5 times, similar to tehA (Table 3) .
- AhpF, bfr and soxS encoding alkyl hydroperoxide reductase, bacterioferritin and SoxS protein respectively, that respond to oxidative stress (Agnez-Lima et al., 2001; Cha et al . , 1995 and Chen et al . , 1999) were also induced about 4 times.
- Table 7 lists the genes responding to DHCP that encode proteins to which any functions have not been yet assigned.
- MrdB Rod-shaped determining protein MrdB 0.24
- TehB Tellurite resistance protein TehB 5.00
- V. harveyi BB170 reporter strain has the quorum-sensing phenotype, sensor 1 " , sensor 2 + . It induces lux expression through the signaling system 2 detector.
- Addition of 10% cell-free culture fluid prepared from V. harveyi BB152 strain (containing the system 2 autoinducer) stimulates luminescence expression in the reporter strain.
- DHCP had been considered as a candidate for the autoinducer AI-2, involved in interspecies quorum-sensing but reported that DHCP did not have ' this activity (Schauder et al., 2001) .
- DHCP inhibits the activity of AI-2.
- AI-2 isolated from V. harveyi BB152 strain showed luminescence (lane 2), while DHCP did not show AI-2 activity (lane 3).
- Sterile AB medium was used as a negative control (lane 1) .
- DHCP 250 ⁇ M- same concentration as the one used for DNA microarray analysis
- AI-2 activity was completely inhibited (lane 4) . It has been reported that the AI-2 gave maximum luminescence at approximately 10 ⁇ M concentration (Schauder et al . , 2001).
- DHCP concentration used in the present assay was in excess of the AI- 2 concentration. It was also tested if DHCP can inhibit AI-2 activity when it is added after maximum luminescence is generated by AI-2. As seen from Fig. 2B, when DHCP was added at a concentration of 250 ⁇ M (closed circles) , AI-2 activity was reduced to zero within 8 min. When it was added at the concentration of 100 ⁇ M (open squares), the AI-2 activity was reduced to zero after 40 min. The corresponding control activity without DHCP addition (open triangles) was completely stable. The present inventors conclude that DHCP efficiently inhibits activity of AI-2.
- DHCP has global effects in E. coli, affecting many genes encoding proteins that are involved in general metabolism and membrane synthesis and function. Interestingly, a number of genes responding to oxidative and osmotic stress were upregulated. In addition, tehA, tehB and cysK that confer resistance to tellurite were upregulated significantly. The modes of resistance to tellurite and the mechanism of its toxicity have been of great interest to researchers and have not been fully understood. It has been shown that (i) cysK mediates tellurite resistance in E.
- TehA and TehB confer resistance to tellurite; Cys residues in these proteins are involved in binding to tellurite and TehB needs S-adenosyl-methionine (SAM) to bind tellurite. It is a dimer that can bind both of these compounds in mediating resistance to tellurite, and (iii) tellurite generates oxidative stress and may replace sulfur in various proteins, rendering them nonfunctional (Syllick-Brenzinger et al . , 2000; Garberg et al., 1999; Summers et al . , 1977 and Vasquez et al . , 2001).
- SAM S-adenosyl-methionine
- quorum sensing typically involves an acylated homoserine lactone (HSL) autoinducer whose synthesis is dependent on a ⁇ LuxI' autoinducer synthase and a cognate , LuxR' autoinducer binding/transcriptional activator protein. Binding of HSL inducer by a LuxR protein results in the transcriptional activation of specific target genes.
- the Luxl- LuxR signaling cascade involved in the bioluminescence was first identified in V. fisheri (Hastings et al . , 1977 and Nealson et al . , 1979). This marine gram-negative bacterium regulates the expression of luciferase with this quorum-sensing circuit.
- AI-2 is homoserine lactone and the exact structure of AI-2 is not known. Recently it has been proposed that AI-2 probably is a furanosyl borate diester (Chen et al . , 2002). Shauder et al examined the quorum-sensing activity of DHCP and found that it did not have AI-2 function (Schauder et al . , 2001) . Interestingly, in the present study it is shown that DHCP in fact inhibited the activity of AI-2.
- DHCP may be generated by biosynthetic pathways involved in synthesis of AI- 2. This raises an interesting possibility that DHCP is involved in the regulation of AI-2 function and in turn may regulate AI- 2-based quorum-sensing in E. coli .
- OmpA is presumably involved in the virulence of Pasturella haemolytica (Mahasreshti et al . , 1997), and (iv) cysK and rpoS increased 3 and 1.2 times, respectively.
- cysK and rpoS increased 3 and 1.2 times, respectively.
- cysK and rpoS Tables 4 and 5 .
- cysK is induced by a signal not similar to AI-2 in an alternate quorum-sensing pathway in E. coli . Unlike AI-2, this signal is produced by E.
- the sap operon ⁇ sapA to sapF has been shown to be involved in the virulence of Erwinia chrysanthemi (Lopez- Solanilla et al . , 1998). It has been reported that the sap operon in V. fisheri is regulated by LuxR-AI complex and thus was presumed to play a role in the bioluminescence (Chen et al . , 2000) .
- the Sap proteins of V. Fisheri are homologous to Sap proteins from E. coli . DHCP inhibited the sap genes (Table 6) , which is consistent with the inhibition of the bioluminescence in the reporter assay.
- a specific regulatory region-like sequence R&R* resides within the sap and the lux regulon of V. fisheri .
- LuxR-AI binds to this region to regulate respective gene expressions (Chen et al . , 2000) . It is possible that DHCP interferes with binding of LuxR-AI complex to the R&R* sequence and this in turn may inhibit the transcription of genes, such as the luciferase operon, in the reporter assay or the sap operon in E. coli . It is believed to speculate that DHCP may ⁇ turn off one pathway of quorum-sensing involving AI-2 and ⁇ turn on' the alternate pathway involving induction of cysK.
- AI-2 activity decreased significantly following the induction of several plasmid-encoded genes in both low and high cell density cultures of E. coli .
- the AI-2 level was linearly related to the accumulation level of each protein product (DeLisa et al., 2001). This introduces the quorum- sensing pathway as a potential target for optimization strategies designed to improve recombinant product yield.
- the inhibition of AI-2 activity by DHCP may prove to be interesting in this aspect.
- DHCP has widespread effects in E. coli . It inhibits some of the genes involved in quorum-sensing processes such as virulence and motility and inhibits activity of one of the quorum-sensing autoinducers itself. On the other hand, certain genes such as cysK known to be involved in alternate quorum sensing pathways were greatly induced, suggesting that DHCP may be regulating the switching on/off of the different quorum-sensing circuits in E. coli .
- Escherichia coli CreBC is a global regulator of gene expression that responds to growth in minimal media. J Biol Chem 276:26955-61.
- Neisseria gonorrhoeae bacterioferritin structural heterogeneity, involvement in iron storage and protection against oxidative stress.
- DHCP 5-dihydroxy-2-cyclopentan-l-one
- LuxS-dependent autoinducer AI-2 controls the expression of an ABC transporter that functions in AI-2 uptake in Salmonella typhimurium .
- osmY a new hyperosmotically inducible gene, encodes a periplasmic protein in Escherichia coli . J Bacteriol 174:3637-44.
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KR10-2004-7013065A KR20040099280A (en) | 2002-03-13 | 2003-03-07 | Effect of treatment with 4,5-dihydroxy-2-cyclopenten-1-one (dhcp) on gene expression and quorum-sensing in bacteria |
DE60325560T DE60325560D1 (en) | 2002-03-13 | 2003-03-07 | EFFECT OF TREATMENT WITH 4,5-DIHYDROXY-2-CYCLOPENEN-1-ON (DHCP) ON GENE EXPRESSION AND QUORUM MEASUREMENT IN BACTERIA |
EP03713993A EP1482793B1 (en) | 2002-03-13 | 2003-03-07 | Effect of treatment with 4,5-dihydroxy- 2-cyclopenten-1-one (dhcp) on gene expression and quorum-sensing in bacteria |
JP2003575898A JP2005519616A (en) | 2002-03-13 | 2003-03-07 | Effect of treatment with 4,5-dihydroxy-2-cyclopenten-1-one (DHCP) on gene expression and quorum sensing in bacteria |
US10/506,778 US20060035317A1 (en) | 2002-03-13 | 2003-03-07 | Effect of treatment with 4,5-dihydroxy-2-cyclopenten-1-one (dhcp) on gene expression and quorum-sensing in bacteria |
AU2003218013A AU2003218013A1 (en) | 2002-03-13 | 2003-03-07 | Effect of treatment with 4,5-dihydroxy- 2-cyclopenten-1-one (dhcp) on gene expression and quorum-sensing in bacteria |
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DE (1) | DE60325560D1 (en) |
TW (1) | TW200400263A (en) |
WO (1) | WO2003077844A2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005056826A1 (en) * | 2003-12-12 | 2005-06-23 | The University Of British Columbia | Transcription-patterned biological activity screening system |
EP2155705A2 (en) * | 2007-06-08 | 2010-02-24 | Georgia State University Research Foundation, Inc. | Compositions for regulating or modulating quorum sensing in bacteria, methods of using the compounds, and methods of regulating or modulating quorum sensing in bacteria |
Families Citing this family (4)
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TW200623897A (en) | 2004-12-02 | 2006-07-01 | Seiko Epson Corp | Image display method, image display device, and projector |
KR100749493B1 (en) | 2006-03-22 | 2007-08-14 | 한국원자력연구원 | Method for the regulation of rpos gene expression and for the enhancement of microorganism susceptibility in escherichia coli |
CN112501091B (en) * | 2019-09-16 | 2022-07-19 | 集美大学 | Vibrio harveyi cheA gene silencing cell strain and application thereof |
CN111304235B (en) * | 2020-02-27 | 2023-03-31 | 绿康生化股份有限公司 | Bacillus licheniformis for enhancing expression of cysP as well as preparation method and application thereof |
Citations (1)
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US6559176B1 (en) * | 2000-05-10 | 2003-05-06 | Princeton University | Compounds and methods for regulating bacterial growth and pathogenesis |
Family Cites Families (3)
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CN1117057C (en) * | 1996-09-27 | 2003-08-06 | 宝酒造株式会社 | Cyclopentenones, process for preparing same, and use thereof |
EP1170007A4 (en) * | 1999-02-19 | 2004-12-15 | Takara Bio Inc | Remedies |
US20020143163A1 (en) * | 2000-08-29 | 2002-10-03 | The University Of Medicine And Dentistry Of New Jersey | Gene conferring resistance to the antibacterial 4,5-dihydroxy-2-cyclopenten-1-one (DHCP), the protein encoded by same, and applications thereof |
-
2003
- 2003-02-27 TW TW092104212A patent/TW200400263A/en unknown
- 2003-03-07 CN CNB03805910XA patent/CN1312290C/en not_active Expired - Fee Related
- 2003-03-07 AT AT03713993T patent/ATE418865T1/en not_active IP Right Cessation
- 2003-03-07 WO PCT/US2003/007081 patent/WO2003077844A2/en active Application Filing
- 2003-03-07 DE DE60325560T patent/DE60325560D1/en not_active Expired - Fee Related
- 2003-03-07 AU AU2003218013A patent/AU2003218013A1/en not_active Abandoned
- 2003-03-07 KR KR10-2004-7013065A patent/KR20040099280A/en not_active Application Discontinuation
- 2003-03-07 EP EP03713993A patent/EP1482793B1/en not_active Expired - Lifetime
- 2003-03-07 JP JP2003575898A patent/JP2005519616A/en active Pending
- 2003-03-07 US US10/506,778 patent/US20060035317A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US6559176B1 (en) * | 2000-05-10 | 2003-05-06 | Princeton University | Compounds and methods for regulating bacterial growth and pathogenesis |
Non-Patent Citations (2)
Title |
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DATABASE MEDLINE [Online] US NATIONAL LIBRARY OF MEDICINE, (BETHESDA, MD, USA) 03 July 2001 PHADTARE ET AL.: 'Antibacterial activity of DHCP and cloning of a gene conferring DHCP resistance in E. coli', XP002968949 Database accession no. 2001274440 * |
See also references of EP1482793A2 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005056826A1 (en) * | 2003-12-12 | 2005-06-23 | The University Of British Columbia | Transcription-patterned biological activity screening system |
EP2155705A2 (en) * | 2007-06-08 | 2010-02-24 | Georgia State University Research Foundation, Inc. | Compositions for regulating or modulating quorum sensing in bacteria, methods of using the compounds, and methods of regulating or modulating quorum sensing in bacteria |
EP2155705A4 (en) * | 2007-06-08 | 2012-02-15 | Univ Georgia State Res Found | Compositions for regulating or modulating quorum sensing in bacteria, methods of using the compounds, and methods of regulating or modulating quorum sensing in bacteria |
EP2529793A3 (en) * | 2007-06-08 | 2013-03-20 | Georgia State University Research Foundation, Inc. | Compositions for regulating or modulating quorum sensing in bacteria, methods of using the compounds, and methods of regulating or modulating quorum sensing in bacteria |
US8653258B2 (en) | 2007-06-08 | 2014-02-18 | Georgia State University Research Foundation, Inc. | Compositions for regulating or modulating quorum sensing in bacteria, methods of using the compounds, and methods of regulating or modulating quorum sensing in bacteria |
Also Published As
Publication number | Publication date |
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DE60325560D1 (en) | 2009-02-12 |
JP2005519616A (en) | 2005-07-07 |
KR20040099280A (en) | 2004-11-26 |
US20060035317A1 (en) | 2006-02-16 |
AU2003218013A1 (en) | 2003-09-29 |
EP1482793A4 (en) | 2005-07-27 |
EP1482793A2 (en) | 2004-12-08 |
TW200400263A (en) | 2004-01-01 |
ATE418865T1 (en) | 2009-01-15 |
WO2003077844A3 (en) | 2004-03-25 |
AU2003218013A8 (en) | 2003-09-29 |
CN1642418A (en) | 2005-07-20 |
EP1482793B1 (en) | 2008-12-31 |
CN1312290C (en) | 2007-04-25 |
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